CN108134595B - Noise detection circuit, noise detection method and grain identification device - Google Patents
Noise detection circuit, noise detection method and grain identification deviceDownload PDFInfo
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Abstract
Description
Translated fromChinese技术领域technical field
本发明涉及触控技术领域，尤指一种噪声检测电路、噪声检测方法及纹路识别装置。The present invention relates to the technical field of touch control, in particular to a noise detection circuit, a noise detection method and a pattern recognition device.
背景技术Background technique
目前的纹路识别装置有电容式、超声波式、电阻式等，各有优缺点，但有个共同的缺陷是感应单元(sensor)感应距离短，该缺陷严重限制了纹路识别装置的结构和性能，影响了其在移动终端产品中的广泛应用。The current texture recognition devices include capacitive, ultrasonic, and resistive types, each with their own advantages and disadvantages, but a common defect is the short sensing distance of the sensor, which severely limits the structure and performance of the texture recognition device. It affects its wide application in mobile terminal products.
光学式纹路识别由于使用光学方式，天然具有长距离可感应的优势，但光学式的sensor由于高分辨率的要求，只能做的很小，又因为信号量通常与sensor的面积成正比，因此其信号量也会变得相当微弱；所以在进行纹路信号检测时，通常使用主动式检测电路来提高信噪比。Optical texture recognition naturally has the advantage of long-distance sensing due to the use of optical methods, but the optical sensor can only do very small due to the requirement of high resolution, and because the amount of signal is usually proportional to the area of the sensor, so The amount of its signal will also become quite weak; so when the texture signal is detected, an active detection circuit is usually used to improve the signal-to-noise ratio.
因此，在光学式纹路识别装置中，如何分析以及去除系统中的噪声是问题的难点，也是其关键所在。由于噪声来源非常复杂，比如来自系统的外部：空气中的电波干扰，来自市电噪声的串扰；也可能来自电路系统的内部：比如电路布线不合理造成电子器件间的相互干扰，电子元器件由于管脚焊接不良造成的1/f噪声，半导体元件所特有的散弹噪声、爆裂噪声，阻性元器件的热噪声等等。另外光学式纹路识别装置在采用人工调试和测试时，由于人工测试，同样会引入噪声，使得噪声排除异常困难，往往会耗费大量的人力和时间，收到的效果却很差。因此在实际研发过程中，对噪声的识别和排除一直是一个亟待解决的问题。Therefore, in the optical pattern recognition device, how to analyze and remove the noise in the system is the difficulty and the key of the problem. Because the sources of noise are very complex, such as from the outside of the system: radio wave interference in the air, crosstalk from mains noise; it may also come from the inside of the circuit system: for example, the mutual interference between electronic devices caused by unreasonable circuit wiring, electronic components due to 1/f noise caused by poor pin soldering, shot noise and popping noise unique to semiconductor components, thermal noise of resistive components, etc. In addition, when the optical pattern recognition device adopts manual debugging and testing, noise will also be introduced due to manual testing, which makes it extremely difficult to eliminate noise, and often consumes a lot of manpower and time, but the results are very poor. Therefore, in the actual research and development process, the identification and elimination of noise has always been an urgent problem to be solved.
发明内容SUMMARY OF THE INVENTION
有鉴于此，本发明实施例了提供一种噪声检测电路及噪声检测方法，用以判断纹路识别装置的噪声来源。In view of this, embodiments of the present invention provide a noise detection circuit and a noise detection method, which are used to determine the noise source of the pattern recognition device.
本发明实施例提供的一种用于纹路识别装置的噪声检测电路，包括：差分放大器、模数转换器、控制单元和第一开关电路；其中，A noise detection circuit for a pattern recognition device provided by an embodiment of the present invention includes: a differential amplifier, an analog-to-digital converter, a control unit, and a first switch circuit; wherein,
所述差分放大器的负向输入端与第一输入信号端相连，所述差分放大器的正向输入端与第二输入信号端端相连，所述差分放大器的输出端与所述模数转换器的输入端相连，所述模数转换器的输出端与所述控制单元的输入端相连，所述模数转换器的基准信号端与所述纹路识别装置中的参考信号端相连，所述控制单元的输出端和所述第一开关电路相连；The negative input terminal of the differential amplifier is connected to the first input signal terminal, the positive input terminal of the differential amplifier is connected to the second input signal terminal, and the output terminal of the differential amplifier is connected to the analog-to-digital converter. The input terminal is connected to the input terminal, the output terminal of the analog-to-digital converter is connected to the input terminal of the control unit, the reference signal terminal of the analog-to-digital converter is connected to the reference signal terminal in the pattern recognition device, and the control unit The output end is connected with the first switch circuit;
所述模数转换器用于：将所述差分放大器输出的信号转换为数字信号后发送给所述控制单元；The analog-to-digital converter is used to: convert the signal output by the differential amplifier into a digital signal and send it to the control unit;
所述第一开关电路用于：在所述控制单元的控制下使所述第一输入信号端接所述参考信号端或接地，使所述第二输入信号端接所述参考信号端或接地；The first switch circuit is used for: under the control of the control unit, the first input signal is terminated to the reference signal terminal or grounded, and the second input signal is terminated to the reference signal terminal or grounded ;
所述控制单元用于：控制所述第一开关电路使所述第一输入信号端接所述参考信号端或接地，使所述第二输入信号端接所述参考信号端或接地，并在所述第一输入信号端接所述参考信号端或接地，以及所述第二输入信号端接所述参考信号端多接地时，对所述模数转换器输出的数字信号进行分析，以确定所述纹路识别装置的噪声来源。The control unit is used for: controlling the first switch circuit to make the first input signal end with the reference signal end or ground, make the second input signal end with the reference signal end or ground, and connect the first input signal to the reference signal end or ground. When the first input signal is terminated to the reference signal terminal or ground, and the second input signal is terminated to the reference signal terminal and is more grounded, the digital signal output by the analog-to-digital converter is analyzed to determine The noise source of the texture recognition device.
可选地，在本发明实施例提供的噪声检测电路中，还包括：采样保持电路，且所述采用保持电路具有至少2个输入端；Optionally, the noise detection circuit provided in the embodiment of the present invention further includes: a sample-and-hold circuit, and the adopt-and-hold circuit has at least two input ends;
所述采样保持电路的第一输入端与所述第一输入信号端相连，所述采样保持电路的第二输入端与所述第二输入信号端相连，所述采样保持电路的第一输出端与所述差分放大器的正向输入端相连，所述采样保持电路的第二输出端与所述差分放大器的负向输入端相连。The first input end of the sample and hold circuit is connected to the first input signal end, the second input end of the sample and hold circuit is connected to the second input signal end, and the first output end of the sample and hold circuit is connected to the positive input terminal of the differential amplifier, and the second output terminal of the sample and hold circuit is connected to the negative input terminal of the differential amplifier.
可选地，在本发明实施例提供的噪声检测电路中，所述采用保持电路具有N+2个输入端；N为所述纹路识别装置中纹路读取信号端的数量；Optionally, in the noise detection circuit provided by the embodiment of the present invention, the adopting and holding circuit has N+2 input terminals; N is the number of texture reading signal terminals in the texture identifying device;
所述噪声检测电路还包括第二开关电路；所述第二开关电路用于在所述控制单元的控制下，使所述采样保持电路的第3输入端至第N+2输入端分别与所述纹路识别装置中的纹路读取信号端相连，且所述采样保持电路的一个输入端对应所述纹路识别装置中的一个纹路读取信号端，所述采样保持电路的不同输入端对应所述纹路识别装置中的不同纹路读取信号端；The noise detection circuit further includes a second switch circuit; the second switch circuit is used to make the third input end to the N+2th input end of the sample and hold circuit respectively connect to the The texture reading signal terminals in the texture recognition device are connected, and one input terminal of the sample and hold circuit corresponds to a texture reading signal terminal in the texture recognition device, and different input terminals of the sample and hold circuit correspond to the Different texture reading signal terminals in the texture recognition device;
所述控制单元还用于控制所述第二开关电路使所述采样保持电路的第3输入端至第N+2输入端分别与对应的所述纹路读取信号端连接，并在所述采样保持电路的第3输入端至第N+2输入端分别与对应的所述纹路读取信号端连接时，对所述模数转换器输出的数字信号进行分析，以进行纹路识别和判断是否存在噪声干扰。The control unit is further configured to control the second switch circuit so that the third input end to the N+2th input end of the sample and hold circuit are respectively connected to the corresponding texture reading signal ends, and the sampling When the third input terminal to the N+2th input terminal of the holding circuit are respectively connected with the corresponding texture reading signal terminals, analyze the digital signal output by the analog-to-digital converter to identify the texture and determine whether there is noise interference.
可选地，在本发明实施例提供的噪声检测电路中，所述第一开关电路具体包括第一开关器件和第二开关器件；Optionally, in the noise detection circuit provided by the embodiment of the present invention, the first switch circuit specifically includes a first switch device and a second switch device;
所述第一开关器件的控制端与所述控制单元的第一输出端相连，所述第一开关器件的第一输入端与所述参考信号端相连，所述第一开关器件的第二输入端接地，所述第一开关器件的输出端与所述第一输入信号端相连；The control terminal of the first switching device is connected to the first output terminal of the control unit, the first input terminal of the first switching device is connected to the reference signal terminal, and the second input terminal of the first switching device is connected to the reference signal terminal. The terminal is grounded, and the output terminal of the first switching device is connected to the first input signal terminal;
所述第二开关器件的控制端与所述控制单元的第二输出端相连，所述第二开关器件的第一输入端与所述参考信号端相连，所述第二开关器件的第二输入端接地，所述第二开关器件的输出端与所述第二输入信号端相连。The control terminal of the second switching device is connected to the second output terminal of the control unit, the first input terminal of the second switching device is connected to the reference signal terminal, and the second input terminal of the second switching device is connected to the reference signal terminal. The terminal is grounded, and the output terminal of the second switching device is connected to the second input signal terminal.
可选地，在本发明实施例提供的噪声检测电路中，所述第二开关电路包括N个开关器件，每一所述开关器件对应一个所述纹路读取信号端；Optionally, in the noise detection circuit provided by the embodiment of the present invention, the second switch circuit includes N switch devices, and each of the switch devices corresponds to one of the texture reading signal terminals;
第n个所述开关器件的输入端与第n个所述纹路读取信号端相连，第n个所述开关器件的输出端与所述采用采样保持电路的第n+2个输入端相连；n为大于零且小于或等于N的任意整数；The input terminal of the nth switching device is connected to the nth texture reading signal terminal, and the output terminal of the nth switching device is connected to the n+2th input terminal using the sample-and-hold circuit; n is any integer greater than zero and less than or equal to N;
各所述开关器件的控制端均与所述控制单元的第三输出端相连。The control terminals of each of the switching devices are connected to the third output terminal of the control unit.
相应地，本发明实施例还提供了一种纹路识别装置，包括本发明实施例提供的上述任一种噪声检测电路。Correspondingly, an embodiment of the present invention further provides a pattern recognition apparatus, including any of the above-mentioned noise detection circuits provided by the embodiment of the present invention.
相应地，本发明实施例还提供了一种上述噪声检测电路的噪声检测方法，包括：Correspondingly, an embodiment of the present invention also provides a noise detection method for the above-mentioned noise detection circuit, including:
当所述纹路识别装置在纹路识别过程中存在噪声干扰时，所述控制单元控制所述第一开关电路使所述第一输入信号端和所述第二输入信号端均接地；When the pattern recognition device has noise interference during the pattern recognition process, the control unit controls the first switch circuit so that both the first input signal terminal and the second input signal terminal are grounded;
在所述第一输入信号端和所述第二输入信号端均接地时，判断所述控制单元接收的所述模数转换器输出的数字信号的波动幅度是否在第一阈值范围内；When both the first input signal terminal and the second input signal terminal are grounded, determine whether the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit is within a first threshold range;
若所述控制单元接收的所述模数转换器输出的数字信号的波动幅度在第一阈值范围内，则确定所述噪声来源于所述纹路识别装置的外部。If the fluctuation amplitude of the digital signal output by the analog-to-digital converter received by the control unit is within a first threshold range, it is determined that the noise originates from the outside of the pattern recognition device.
可选地，在本发明实施例提供的噪声检测方法中，在所述第一输入信号端和所述第二输入信号端均接所述参考信号端时，还包括：Optionally, in the noise detection method provided by the embodiment of the present invention, when both the first input signal terminal and the second input signal terminal are connected to the reference signal terminal, the method further includes:
若所述控制单元接收的所述模数转换器输出的数字信号的波动幅度超出所述第一阈值范围，则所述控制单元控制所述第一开关电路使所述第一输入信号端接地，所述第二输入信号端接所述参考信号端；If the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit exceeds the first threshold range, the control unit controls the first switch circuit to ground the first input signal terminal, the second input signal terminal is connected to the reference signal terminal;
在所述第一输入信号端接地，所述第二输入信号端接所述参考信号端时，判断所述控制单元当前接收的数字信号的波动幅度；When the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, determining the fluctuation range of the digital signal currently received by the control unit;
若所述数字信号的波动幅度在第二阈值范围内，则所述控制单元控制所述第一开关电路使所述第一输入信号端接所述参考信号端，所述第二输入信号端接地；If the fluctuation range of the digital signal is within a second threshold range, the control unit controls the first switch circuit to connect the first input signal to the reference signal terminal and the second input signal to ground ;
根据所述控制单元当前接收的所述数字信号的波动幅度，以及在所述第一输入信号端接地且所述第二输入信号端接所述参考信号端时接收的数字信号的波动幅度，确定在纹路识别过程中存在的噪声是否来源于所述纹路识别装置的参考信号源；其中所述参考信号源用于向所述参考信号端提供参考信号。Determine according to the fluctuation amplitude of the digital signal currently received by the control unit and the fluctuation amplitude of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal Whether the noise existing in the texture identification process originates from the reference signal source of the texture identification device; wherein the reference signal source is used to provide a reference signal to the reference signal terminal.
可选地，在本发明实施例提供的噪声检测方法中，根据所述控制单元当前接收的所述数字信号的波动幅度，以及在所述第一输入信号端接地且所述第二输入信号端接所述参考信号端时接收的数字信号的波动幅度，确定在纹路识别过程中存在的噪声是否来源于所述纹路识别装置的参考信号源，具体包括：Optionally, in the noise detection method provided in the embodiment of the present invention, according to the fluctuation amplitude of the digital signal currently received by the control unit, and the first input signal terminal is grounded and the second input signal terminal is grounded. The fluctuation amplitude of the digital signal received when the reference signal terminal is connected to determine whether the noise existing in the pattern recognition process originates from the reference signal source of the pattern recognition device, specifically including:
若所述控制单元当前接收的数字信号的波动幅度，超出在所述第一输入信号端接地且所述第二输入信号端接所述参考信号端时接收的数字信号的波动幅度预设范围；If the fluctuation range of the digital signal currently received by the control unit exceeds the predetermined range of the fluctuation range of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal;
则通过对所述参考信号源进行重新配置来确定在纹路识别过程中存在的噪声是否来源于所述参考信号源。Then, by reconfiguring the reference signal source, it is determined whether the noise existing in the pattern recognition process originates from the reference signal source.
可选地，在本发明实施例提供的噪声检测方法中，通过对所述参考信号源进行重新配置来确定在纹路识别过程中存在的噪声是否来源于所述参考信号源，具体包括：Optionally, in the noise detection method provided by the embodiment of the present invention, it is determined by reconfiguring the reference signal source whether the noise existing in the pattern recognition process originates from the reference signal source, specifically including:
所述控制单元对所述参考信号源进行重新配置，并记录配置次数；The control unit reconfigures the reference signal source and records the configuration times;
判断所述配置次数是否小于K；K为大于1的整数；Determine whether the configuration times are less than K; K is an integer greater than 1;
若所述配置次数小于K，则判断所述控制单元当前接收的数字信号的波动幅度是否仍超出当所述第一输入信号端接地且所述第二输入信号端接所述参考信号端时接收的数字信号的波动幅度预设范围；If the configuration times is less than K, determine whether the fluctuation range of the digital signal currently received by the control unit still exceeds that received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal The preset range of the fluctuation amplitude of the digital signal;
若仍超出，则所述控制单元对所述参考信号源重新配置，直到配置次数大于或等于N次，则确定所述噪声源于参考信号源损坏。If it still exceeds, the control unit reconfigures the reference signal source until the number of times of configuration is greater than or equal to N times, then it is determined that the noise originates from the damage of the reference signal source.
可选地，在本发明实施例提供的噪声检测方法中，在所述第一输入信号端接所述参考信号端，所述第二输入信号端接地时，还包括：Optionally, in the noise detection method provided by the embodiment of the present invention, when the first input signal terminal is connected to the reference signal terminal and the second input signal terminal is grounded, the method further includes:
若所述控制单元当前接收的数字信号的波动幅度，与所述第一输入信号端接地且所述第二输入信号端接所述参考信号端时接收的数字信号的波动幅度相比，差异在所述预设范围内，则所述控制单元保存错误代码以供用户分析。If the fluctuation amplitude of the digital signal currently received by the control unit is compared with the fluctuation amplitude of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, the difference is: Within the preset range, the control unit saves the error code for analysis by the user.
可选地，在本发明实施例提供的噪声检测方法中，在所述第一输入信号端接地，所述第二输入信号端接所述参考信号端时；还包括：Optionally, in the noise detection method provided by the embodiment of the present invention, when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal; further comprising:
若所述控制单元当前接收的数字信号的波动幅度超出所述第二阈值范围，则重启所述纹路识别装置，并记录重启次数；If the fluctuation range of the digital signal currently received by the control unit exceeds the second threshold range, restart the texture recognition device, and record the number of restarts;
判断在所述纹路识别装置重启后在纹路识别过程中是否存在噪声干扰；Determine whether there is noise interference during the pattern recognition process after the pattern recognition device is restarted;
若存在噪声干扰，则确定重启次数是否小于M；M为大于1的整数；If there is noise interference, determine whether the number of restarts is less than M; M is an integer greater than 1;
若重启次数小于M，则继续重启所述纹路识别装置，直至所述重启次数大于或等于M后，确定所述噪声源于所述纹路识别装置的电源。If the number of restarts is less than M, continue to restart the texture recognition device, until the number of restarts is greater than or equal to M, it is determined that the noise originates from the power supply of the texture recognition device.
可选地，在本发明实施例提供的噪声检测方法中，判断在所述纹路识别装置重启后在纹路识别过程中是否存在噪声干扰之后，还包括：Optionally, in the noise detection method provided in the embodiment of the present invention, after judging whether there is noise interference during the texture identification process after the texture identification device is restarted, the method further includes:
若不存在噪声，则确定所述噪声源于所述纹路识别装置的硬件运行错误。If there is no noise, it is determined that the noise originates from a hardware operation error of the texture recognition device.
可选地，在本发明实施例提供的噪声检测方法中，K＝2。Optionally, in the noise detection method provided by the embodiment of the present invention, K=2.
可选地，在本发明实施例提供的噪声检测方法中，M＝3。Optionally, in the noise detection method provided by the embodiment of the present invention, M=3.
本发明有益效果如下：The beneficial effects of the present invention are as follows:
本发明实施例提供的上述噪声检测电路、噪声检测方法及纹路识别装置，利用控制单元对第一开关电路进行控制，使第一输入信号端接参考信号端或接地，使第二输入信号端接参考信号端或接地，从而差分放大器对接收的第一输入信号端和第二输入信号端在不同情况下的信号进行运算，并将运算结果利用模数转换器转换为数字信号，从而控制单元通过对模数转换器输出的数字信号进行分析，来确定纹路识别装置的噪声来源。In the above-mentioned noise detection circuit, noise detection method, and pattern identification device provided by the embodiments of the present invention, the control unit is used to control the first switch circuit, so that the first input signal is terminated with the reference signal terminal or ground, and the second input signal is terminated with Refer to the signal terminal or ground, so that the differential amplifier operates on the received signals of the first input signal terminal and the second input signal terminal under different conditions, and converts the operation result into a digital signal using an analog-to-digital converter, so that the control unit passes The digital signal output by the analog-to-digital converter is analyzed to determine the noise source of the pattern recognition device.
附图说明Description of drawings
图1为本发明实施例提供的噪声检测电路的结构示意图之一；FIG. 1 is one of the schematic structural diagrams of a noise detection circuit provided by an embodiment of the present invention;
图2为本发明实施例提供的噪声检测电路的结构示意图之二；FIG. 2 is a second schematic structural diagram of a noise detection circuit provided by an embodiment of the present invention;
图3为本发明实施例提供的噪声检测电路的结构示意图之三；FIG. 3 is a third schematic structural diagram of a noise detection circuit provided by an embodiment of the present invention;
图4为本发明实施例提供的噪声检测方法的流程示意图之一；FIG. 4 is one of the schematic flowcharts of the noise detection method provided by the embodiment of the present invention;
图5为本发明实施例提供的噪声检测方法的流程示意图之二；FIG. 5 is a second schematic flowchart of a noise detection method provided by an embodiment of the present invention;
图6为本发明实施例提供的纹路识别装置的结构示意图之一；FIG. 6 is one of the schematic structural diagrams of a texture recognition device provided by an embodiment of the present invention;
图7为本发明实施例提供的纹路识别装置的结构示意图之二；FIG. 7 is a second schematic structural diagram of a texture recognition device provided by an embodiment of the present invention;
图8为本发明实施例提供的纹路识别装置的结构示意图之三。FIG. 8 is a third schematic structural diagram of a texture recognition apparatus provided by an embodiment of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
附图中各部件的形状和大小不反映真实比例，目的只是示意说明本发明内容。The shapes and sizes of the components in the drawings do not reflect the actual scale, and are only intended to illustrate the content of the present invention.
本发明实施例提供的一种用于纹路识别装置的噪声检测电路，如图1所示，包括：差分放大器01、模数转换器02、控制单元03和第一开关电路04；其中，A noise detection circuit for a texture recognition device provided by an embodiment of the present invention, as shown in FIG. 1 , includes: a
差分放大器01的负向输入端与第一输入信号端input1相连，差分放大器01的正向输入端与第二输入信号端端input2相连，差分放大器01的输出端与模数转换器02的输入端相连，模数转换器02的输出端与控制单元03的输入端相连，模数转换器02的基准信号端与纹路识别装置中的参考信号端Vref相连，控制单元03的输出端和第一开关电路04相连；The negative input terminal of the
模数转换器02用于：将差分放大器01输出的信号转换为数字信号后发送给控制单元03；The analog-to-
第一开关电路04用于：在控制单元03的控制下使第一输入信号端input1接参考信号端Vref或接地END，使第二输入信号端input2接参考信号端Vref或接地；The
控制单元02用于：控制第一开关电路04使第一输入信号端input1接参考信号端Vref或接地，使第二输入信号端input2接参考信号端Vref或接地，并在第一输入信号端input1接参考信号端Vref或接地，以及第二输入信号端input2接参考信号端Vref或接地时，对模数转换器02输出的数字信号进行分析，以确定纹路识别装置的噪声来源。The
本发明实施例提供的噪声检测电路，利用控制单元对第一开关电路进行控制，使第一输入信号端接参考信号端或接地，使第二输入信号端接参考信号端或接地，从而差分放大器对接收的第一输入信号端和第二输入信号端在不同情况下的信号进行运算，并将运算结果利用模数转换器转换为数字信号，从而控制单元通过对模数转换器输出的数字信号进行分析，来确定纹路识别装置的噪声来源。In the noise detection circuit provided by the embodiment of the present invention, the control unit is used to control the first switch circuit, so that the first input signal is terminated with the reference signal terminal or ground, and the second input signal is terminated with the reference signal terminal or ground, so that the differential amplifier Perform operation on the received signals of the first input signal terminal and the second input signal terminal under different conditions, and convert the operation result into a digital signal using an analog-to-digital converter, so that the control unit passes the digital signal output by the analog-to-digital converter. An analysis is performed to determine the noise source of the texture recognition device.
可选地，在本发明实施例提供的噪声检测电路中，如图2所示，还包括：采样保持电路05，且采用保持电路具有至少2个输入端in1～inN+2；Optionally, the noise detection circuit provided in the embodiment of the present invention, as shown in FIG. 2 , further includes: a sample-and-
采样保持电路05的第一输入端in1与第一输入信号端input1相连，采样保持电路05的第二输入端in2与第二输入信号端input2相连，采样保持电路05的第一输出端与差分放大器01的正向输入端相连，采样保持电路05的第二输出端与差分放大器01的负向输入端相连。The first input terminal in1 of the sample and hold
可选地，在本发明实施例提供的噪声检测电路中，如图2所示，采用保持电路05具有N+2个输入端in1～inN+2；N为纹路识别装置中纹路读取信号端Readout的数量；Optionally, in the noise detection circuit provided by the embodiment of the present invention, as shown in FIG. 2 , the holding
噪声检测电路还包括第二开关电路06；第二开关电路06用于在控制单元的控制下，使采样保持电路05的第3输入端in3至第N+2输入端nN+2分别与纹路识别装置中的纹路读取信号端Readoutn相连，且采样保持电路的一个输入端in对应纹路识别装置中的一个纹路读取信号端Readout，采样保持电路05的不同输入端in对应纹路识别装置中的不同纹路读取信号端Readout；The noise detection circuit also includes a
控制单元03还用于控制第二开关电路06使采样保持电路05的第3输入端in3至第N+2输入端nN+2分别与对应的纹路读取信号端Readout连接，并在采样保持电路05的第3输入端in3至第N+2输入端nN+2分别与对应的纹路读取信号端Readout连接时，对模数转换器02输出的数字信号进行分析，以进行纹路识别和判断是否存在噪声干扰。The
本发明实施例提供的上述噪声检测电路，利用采样保持电路不仅可以接收第一输入信号端和第二输入信号端的信号，还接收纹路读取信号端的信号，当接收第一输入信号端和第二输入信号端的信号时，可以判断噪声来源，当接收纹路读取信号端的信号时，将多个纹路读取信号端的信号进行保持，然后通过差分放大器对信号进行放大，直至适合被模数转换电路进行转换；最后被放大的电压信号被模数转换电路转化成数字信号后，被控制单元进行运算处理，从而得到最后的谷脊信号，实现纹路识别。具体纹路识别原理与现有技术相同，在此不作赘述。因此本发明实施例提供的噪声检测电路，既能纹路识别装置中的噪声来源，有可以实现纹路识别。In the above-mentioned noise detection circuit provided by the embodiment of the present invention, the sample-and-hold circuit can not only receive the signals of the first input signal terminal and the second input signal terminal, but also receive the signal of the pattern reading signal terminal. When receiving the first input signal terminal and the second input signal terminal When the signal at the signal end is input, the source of the noise can be judged. When receiving the signal at the signal end of the line reading signal, the signals at the signal end of the plurality of lines reading the signal are kept, and then the signal is amplified by the differential amplifier until it is suitable for the analog-to-digital conversion circuit. Conversion: After the finally amplified voltage signal is converted into a digital signal by the analog-to-digital conversion circuit, it is processed by the control unit to obtain the final valley ridge signal to realize the pattern recognition. The specific pattern recognition principle is the same as that in the prior art, and will not be repeated here. Therefore, the noise detection circuit provided by the embodiment of the present invention can not only identify the noise source in the texture identification device, but also realize texture identification.
由于目前现有的纹路识别装置也是通过采样保持电路、差分放大器、模数转换器和控制单元进行纹路识别的，因此本发明实施例提供的噪声检测电路，相当于在现有纹路识别装置中的采样保持电路、差分放大器、模数转换器和控制单元的基础上，增加了第一开关电路，因此成本较低。Since the existing texture identification device also uses a sample-and-hold circuit, a differential amplifier, an analog-to-digital converter, and a control unit to identify the texture, the noise detection circuit provided by the embodiment of the present invention is equivalent to the existing texture identification device. On the basis of the sample and hold circuit, the differential amplifier, the analog-to-digital converter and the control unit, a first switch circuit is added, so the cost is low.
可选地，在本发明实施例提供的噪声检测电路中，如图3所示，第一开关电路04具体包括第一开关器件s1和第二开关器件s2；Optionally, in the noise detection circuit provided by the embodiment of the present invention, as shown in FIG. 3 , the
第一开关器件s1的控制端与控制单元03的第一输出端相连，第一开关器件s1的第一输入端与参考信号端Vref相连，第一开关器件s1的第二输入端接地，第一开关器件s1的输出端与第一输入信号端Input1相连；The control terminal of the first switching device s1 is connected to the first output terminal of the
第二开关器件s2的控制端与控制单元03的第二输出端相连，第二开关器件s2的第一输入端与参考信号端Vref相连，第二开关器件s2的第二输入端接地，第二开关器件s2的输出端与第二输入信号端Input2相连。The control terminal of the second switching device s2 is connected to the second output terminal of the
可选地，在本发明实施例提供的噪声检测电路中，如图3所示，第二开关电路包括N个开关器件k1～kN，每一开关器件k对应一个纹路读取信号端Readout；Optionally, in the noise detection circuit provided by the embodiment of the present invention, as shown in FIG. 3 , the second switch circuit includes N switch devices k1 to kN, and each switch device k corresponds to a texture reading signal terminal Readout;
第n个开关器件kn的输入端与第n个纹路读取信号端Readout相连，第n个开关器件kn的输出端与采用采样保持电路的第n+2个输入端inn+2相连；n为大于零且小于或等于N的任意整数；The input terminal of the nth switching device kn is connected to the nth line reading signal terminal Readout, and the output terminal of the nth switching device kn is connected to the n+2th input terminal inn+2 using a sample-and-hold circuit; n is any integer greater than zero and less than or equal to N;
各开关器件k的控制端均与控制单元03的第三输出端相连。The control terminals of each switching device k are connected to the third output terminal of the
下面结合噪声检测方法对本发明实施例提供的该噪声检测电路的工作原理进行详细介绍。The working principle of the noise detection circuit provided by the embodiment of the present invention will be described in detail below with reference to the noise detection method.
基于同一发明构思，本发明实施例还提供了一种上述噪声检测电路的噪声检测方法，当纹路识别装置在纹路识别过程中存在噪声干扰时，如图4所示，包括：Based on the same inventive concept, an embodiment of the present invention also provides a noise detection method for the above-mentioned noise detection circuit. When there is noise interference in the texture identification process, the texture identification device, as shown in FIG. 4 , includes:
S401、控制单元控制第一开关电路使第一输入信号端和第二输入信号端均接地；S401, the control unit controls the first switch circuit so that both the first input signal terminal and the second input signal terminal are grounded;
S402、在第一输入信号端和第二输入信号端均接地时，判断控制单元接收的模数转换器输出的数字信号的波动幅度是否在第一阈值范围内；S402, when both the first input signal terminal and the second input signal terminal are grounded, determine whether the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit is within a first threshold range;
S403、若控制单元接收的模数转换器输出的数字信号的波动幅度在第一阈值范围内，则确定噪声来源于纹路识别装置的外部。S403. If the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit is within the first threshold range, determine that the noise originates from the outside of the pattern recognition device.
在本发明实施例提供的上述噪声检测方法中，由于差分放大器输出的信号是由(第二输入信号端的信号+第二输入信号端的噪声)-(第一输入信号端的信号+第一输入信号端的噪声)决定的，因此当第一输入信号端和第二输入信号端均接地时，此时差分放大器得到的信号为0+noise(0)-0-noise(0)，如果模数转换器输出的数字信号的波动幅度是否在第一阈值范围内，则说明系统内部的噪声较小，因此可以认为此时噪声主要来源不在纹路识别装置自身的系统内，噪声来源于纹路识别装置的外部，可能是由于外界的电磁波干扰所致。如果系统存在这种噪声，则可以通过添加屏蔽罩的方法消除噪声。In the above-mentioned noise detection method provided by the embodiment of the present invention, since the signal output by the differential amplifier is composed of (the signal at the second input signal terminal + the noise at the second input signal terminal) - (the signal at the first input signal terminal + the noise at the first input signal terminal) Therefore, when the first input signal terminal and the second input signal terminal are both grounded, the signal obtained by the differential amplifier is 0+noise(0)-0-noise(0). If the analog-to-digital converter outputs Whether the fluctuation range of the digital signal is within the first threshold range, it means that the noise inside the system is small, so it can be considered that the main source of noise is not in the system of the pattern recognition device at this time, and the noise comes from the outside of the pattern recognition device. It is caused by external electromagnetic wave interference. If there is such noise in the system, it can be eliminated by adding a shield.
可选地，在本发明实施例提供的噪声检测方法中，在第一输入信号端和第二输入信号端均接地时，若控制单元接收的模数转换器输出的数字信号的波动幅度超出第一阈值范围，则说明噪声可能来源于纹路识别装置的内部，需要进一步判断噪声的来源；具体包括：Optionally, in the noise detection method provided by the embodiment of the present invention, when both the first input signal terminal and the second input signal terminal are grounded, if the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit exceeds the A threshold range indicates that the noise may originate from the inside of the pattern recognition device, and the source of the noise needs to be further judged; specifically:
控制单元控制第一开关电路使第一输入信号端接地，第二输入信号端接参考信号端；The control unit controls the first switch circuit so that the first input signal terminal is grounded, and the second input signal terminal is connected to the reference signal terminal;
在第一输入信号端接地，第二输入信号端接参考信号端时，判断控制单元当前接收的数字信号的波动幅度；When the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, determine the fluctuation range of the digital signal currently received by the control unit;
若数字信号的波动幅度在第二阈值范围内，则控制单元控制第一开关电路使第一输入信号端接参考信号端，第二输入信号端接地；If the fluctuation range of the digital signal is within the second threshold range, the control unit controls the first switch circuit so that the first input signal terminal is connected to the reference signal terminal, and the second input signal terminal is grounded;
根据控制单元当前接收的数字信号的波动幅度，以及在第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度，确定在纹路识别过程中存在的噪声是否来源于纹路识别装置的参考信号源；其中参考信号源用于向参考信号端提供参考信号。According to the fluctuation amplitude of the digital signal currently received by the control unit and the fluctuation amplitude of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, it is determined whether the noise existing in the pattern recognition process is the source or not. A reference signal source in the pattern recognition device; wherein the reference signal source is used to provide a reference signal to the reference signal terminal.
具体地，当第一输入信号端接地，第二输入信号端接参考信号端时，此时差分放大器得到的信号为Vref+noise(Vref)-0-noise(0)，由于模数转换器的基准信号端接的参考信号端，因此参考信号端的噪声和模数转换器的Vref噪声具有相同的行为特性，因此，如果此时控制单元当前接收的数字信号的波动幅度仍然较大，则噪声可能来源于纹路识别装置的参考信号源。因为，如果当参考信号源存在噪声干扰时，可能引起模数转换器的量化不准，导致最终输出的数字信号的波动幅度较大。Specifically, when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, the signal obtained by the differential amplifier is Vref+noise(Vref)-0-noise(0). The reference signal terminal to which the reference signal is terminated, so the noise at the reference signal terminal and the Vref noise of the analog-to-digital converter have the same behavioral characteristics. Therefore, if the fluctuation amplitude of the digital signal currently received by the control unit is still large at this time, the noise may be The reference signal source from the texture recognition device. Because, if there is noise interference in the reference signal source, the quantization of the analog-to-digital converter may be inaccurate, resulting in a larger fluctuation range of the final output digital signal.
具体地，当第一输入信号端接参考信号端，第二输入信号端接地时，此时差分放大器得到的信号为0+noise(0)-Vref-noise(Vref)，由于差分放大器输出的信号中的参考信号的噪声行为与模数转换器的基准信号源的噪声行为相反，如果此时，模数转换器输出的数字信号中波动幅度较大，则证明是噪声来源为参考信号源。Specifically, when the first input signal terminal is connected to the reference signal terminal and the second input signal terminal is grounded, the signal obtained by the differential amplifier is 0+noise(0)-Vref-noise(Vref). The noise behavior of the reference signal in the analog-to-digital converter is opposite to the noise behavior of the reference signal source of the analog-to-digital converter. If the fluctuation amplitude of the digital signal output by the analog-to-digital converter is large at this time, it is proved that the noise source is the reference signal source.
可选地，在本发明实施例提供的噪声检测方法中，根据控制单元当前接收的数字信号的波动幅度，以及在第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度，确定在纹路识别过程中存在的噪声是否来源于纹路识别装置的参考信号源，具体包括：Optionally, in the noise detection method provided by the embodiment of the present invention, according to the fluctuation amplitude of the digital signal currently received by the control unit, and the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal. The fluctuation amplitude of the signal determines whether the noise existing in the pattern recognition process originates from the reference signal source of the pattern recognition device, specifically including:
若控制单元当前接收的数字信号的波动幅度，超出在第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度预设范围；if the fluctuation range of the digital signal currently received by the control unit exceeds the preset range of the fluctuation range of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal;
则通过对参考信号源进行重新配置来确定在纹路识别过程中存在的噪声是否来源于参考信号源。Then, by reconfiguring the reference signal source, it is determined whether the noise existing in the pattern recognition process originates from the reference signal source.
具体地，通过对参考信号源进行重新配置来确定在纹路识别过程中存在的噪声是否来源于参考信号源，若参考信号源重新配置多次后仍然噪声较大，可以确定认为噪声是否来源于参考信号源的硬件损坏(可能是器件固有1/f，散弹噪声等增大，也可能是由于器件已经被烧毁)，因此可以通过更换新的参考信号源消除噪声干扰。Specifically, by reconfiguring the reference signal source, it is determined whether the noise existing in the pattern recognition process originates from the reference signal source. The hardware of the signal source is damaged (it may be the inherent 1/f of the device, the increase of shot noise, etc., or it may be because the device has been burned), so the noise interference can be eliminated by replacing the new reference signal source.
可选地，在本发明实施例提供的噪声检测方法中，通过对参考信号源进行重新配置来确定在纹路识别过程中存在的噪声是否来源于参考信号源，具体包括：Optionally, in the noise detection method provided by the embodiment of the present invention, it is determined by reconfiguring the reference signal source whether the noise existing in the pattern recognition process originates from the reference signal source, which specifically includes:
控制单元对参考信号源进行重新配置，并记录配置次数；The control unit reconfigures the reference signal source and records the configuration times;
判断配置次数是否小于K；Determine whether the number of configurations is less than K;
若配置次数小于K，则判断控制单元当前接收的数字信号的波动幅度是否仍超出当第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度预设范围；If the number of configurations is less than K, determine whether the fluctuation range of the digital signal currently received by the control unit still exceeds the preset range of the fluctuation range of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal;
若仍超出，则控制单元对参考信号源重新配置，直到配置次数大于或等于N次，则确定噪声源于参考信号源损坏。If it is still exceeded, the control unit reconfigures the reference signal source until the number of configurations is greater than or equal to N times, then it is determined that the noise originates from the damage of the reference signal source.
在具体实施时，在本发明实施例提供的噪声检测方法中，K为大于1的整数，一般取2。During specific implementation, in the noise detection method provided by the embodiment of the present invention, K is an integer greater than 1, and generally takes 2.
可选地，在本发明实施例提供的噪声检测方法中，在第一输入信号端接参考信号端，第二输入信号端接地时，还包括：Optionally, in the noise detection method provided by the embodiment of the present invention, when the first input signal terminal is connected to the reference signal terminal and the second input signal terminal is grounded, the method further includes:
若控制单元当前接收的数字信号的波动幅度，与第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度相比，差异在预设范围内，则控制单元保存错误代码以供用户分析。If the fluctuation amplitude of the digital signal currently received by the control unit is compared with the fluctuation amplitude of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, the difference is within the preset range, the control unit will Save error codes for user analysis.
在具体实施时，在第一输入信号端接地，第二输入信号端接参考信号端时，如果若控制单元当前接收的数字信号的波动幅度超出第二阈值范围，则说明噪声不是来源于参考信号源，需要判断噪声是不是来源于纹路识别装置自身。In specific implementation, when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal, if the fluctuation range of the digital signal currently received by the control unit exceeds the second threshold range, it means that the noise does not originate from the reference signal It is necessary to judge whether the noise comes from the texture recognition device itself.
因此，可选地，在本发明实施例提供的噪声检测方法中，在第一输入信号端接地，第二输入信号端接参考信号端时；还包括：Therefore, optionally, in the noise detection method provided by the embodiment of the present invention, when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal; further comprising:
若控制单元当前接收的数字信号的波动幅度超出第二阈值范围，重启纹路识别装置，并记录重启次数；If the fluctuation range of the digital signal currently received by the control unit exceeds the second threshold range, restart the pattern recognition device, and record the number of restarts;
判断在纹路识别装置重启后在纹路识别过程中是否存在噪声干扰；Determine whether there is noise interference during the pattern recognition process after the pattern recognition device is restarted;
若存在噪声干扰，则确定重启次数是否小于M；If there is noise interference, determine whether the number of restarts is less than M;
若重启次数小于M，则继续重启纹路识别装置，直至重启次数大于或等于M后，确定噪声源于纹路识别装置的电源。If the number of restarts is less than M, continue to restart the pattern recognition device until the number of restarts is greater than or equal to M, and it is determined that the noise originates from the power supply of the pattern recognition device.
在具体实施时，在本发明实施例提供的噪声检测方法中，M为大于1的整数，一般取3。During specific implementation, in the noise detection method provided by the embodiment of the present invention, M is an integer greater than 1, and generally takes 3.
进一步地，由电源因引起的噪声可以通过更换更高性能的电源(ups)供电进行解决。Further, the noise caused by the power supply can be solved by replacing the power supply with a higher performance power supply (ups).
可选地，在本发明实施例提供的噪声检测方法中，判断在纹路识别装置重启后在纹路识别过程中是否存在噪声干扰之后，还包括：Optionally, in the noise detection method provided by the embodiment of the present invention, after judging whether there is noise interference during the pattern recognition process after the pattern recognition device is restarted, the method further includes:
若不存在噪声，则确定噪声源于纹路识别装置的硬件运行错误。If there is no noise, it is determined that the noise originates from a hardware operating error of the texture recognition device.
下面结合图3所示的噪声检测电路，详细说明本发明实施例提供的噪声检测方法。当纹路识别装置在纹路识别过程中存在噪声干扰时，如图5所示，确认噪声来源具体包括以下步骤：The noise detection method provided by the embodiment of the present invention will be described in detail below with reference to the noise detection circuit shown in FIG. 3 . When the pattern recognition device has noise interference during the pattern recognition process, as shown in Figure 5, confirming the noise source specifically includes the following steps:
S501、控制单元控制第一开关电路使第一输入信号端和第二输入信号端均接地。S501. The control unit controls the first switch circuit so that both the first input signal terminal and the second input signal terminal are grounded.
S502、判断控制单元接收的模数转换器输出的数字信号的波动幅度是否在第一阈值范围内。S502. Determine whether the fluctuation range of the digital signal output by the analog-to-digital converter received by the control unit is within a first threshold range.
若超出第一阈值范围内，则执行步骤S503；若在第一阈值范围内，则确定噪声来源于纹路识别装置的外部。If it exceeds the range of the first threshold value, step S503 is performed; if it is within the range of the first threshold value, it is determined that the noise originates from the outside of the texture recognition device.
S503、控制单元控制第一开关电路使第一输入信号端接地，第二输入信号端接参考信号端。S503 , the control unit controls the first switch circuit so that the first input signal terminal is grounded, and the second input signal terminal is connected to the reference signal terminal.
S504、判断控制单元当前接收的数字信号的波动幅度是否在第二阈值范围内。S504. Determine whether the fluctuation range of the digital signal currently received by the control unit is within the second threshold range.
若超出第二阈值范围，则开始执行步骤S505；若在第二阈值范围内，则执行步骤S5041。If it exceeds the second threshold range, then start to execute step S505; if it is within the second threshold range, execute step S5041.
S505、重启纹路识别装置，并记录重启次数。S505, restart the texture recognition device, and record the number of restarts.
S506、判断在纹路识别装置重启后在纹路识别过程中是否存在噪声干扰。S506. Determine whether there is noise interference during the pattern recognition process after the pattern recognition device is restarted.
若存在噪声干扰，则执行步骤S507；若不存在噪声，则确定噪声源于纹路识别装置的硬件运行错误。If there is noise interference, step S507 is performed; if there is no noise, it is determined that the noise originates from a hardware operation error of the pattern recognition device.
S507、确定重启次数是否小于M；S507, determine whether the number of restarts is less than M;
若重启次数小于M，则返回执行步骤S503；若重启次数大于或等于M，则确定噪声源于纹路识别装置的电源。If the number of restarts is less than M, return to step S503; if the number of restarts is greater than or equal to M, it is determined that the noise originates from the power supply of the texture recognition device.
S5041、控制单元控制第一开关电路使第一输入信号端接参考信号端，第二输入信号端接地；S5041, the control unit controls the first switch circuit so that the first input signal terminal is connected to the reference signal terminal, and the second input signal terminal is grounded;
S5042、判断控制单元当前接收的数字信号的波动幅度，是否超出在第一输入信号端接地且第二输入信号端接参考信号端时接收的数字信号的波动幅度预设范围；S5042. Determine whether the fluctuation range of the digital signal currently received by the control unit exceeds the preset range of the fluctuation range of the digital signal received when the first input signal terminal is grounded and the second input signal terminal is connected to the reference signal terminal;
若超出预设范围，则执行步骤S5043；若没超出，则控制单元保存错误代码以供用户分析。If it exceeds the preset range, step S5043 is executed; if not, the control unit saves the error code for the user to analyze.
S5043、控制单元对参考信号源进行重新配置，并记录配置次数；S5043, the control unit reconfigures the reference signal source, and records the configuration times;
S5044、判断配置次数是否小于K；S5044. Determine whether the configuration times are less than K;
若配置次数小于K，则返回步骤S5041；若配置次数大于或等于K，则确定噪声源于参考信号源损坏。If the configuration times are less than K, return to step S5041; if the configuration times are greater than or equal to K, it is determined that the noise originates from the damage of the reference signal source.
基于同一发明构思，本发明实施例还提供了一种纹路识别装置，包括本发明实施例提供的上述任一种噪声检测电路。由于该纹路识别装置解决问题的原理与前述一种噪声检测电路相似，因此该纹路识别装置的实施可以参见前述噪声检测电路的实施，重复之处不再赘述。Based on the same inventive concept, an embodiment of the present invention further provides a pattern recognition device, which includes any of the above-mentioned noise detection circuits provided by the embodiment of the present invention. Since the principle of the texture identification device for solving the problem is similar to that of the aforementioned noise detection circuit, the implementation of the texture identification device can refer to the implementation of the aforementioned noise detection circuit, and the repetition will not be repeated.
在具体实施时，如图6所示，纹路检测装置中一般还包括若干呈矩阵排列的感光单元Sensor，每个感光单元Sensor由一个光敏二极管pin和至少一个薄膜晶体管TFT组成。在进行指纹扫描时，由于指纹谷脊间的差异，光源照射到手指上的会产生不同的反射，从而使得到达光敏二极管pin处的光强出现变化，产生不同的光电流差异，在薄膜晶体管TFT的控制下，只要采集纹路读取信号端Readout的信号就可以依次读取出各个光敏二极管pin的电流差异，即可实现对指纹谷脊的检测。In specific implementation, as shown in FIG. 6 , the texture detection device generally further includes a plurality of photosensitive units Sensors arranged in a matrix, and each photosensitive unit Sensor is composed of a photosensitive diode pin and at least one thin film transistor TFT. During fingerprint scanning, due to the difference between the valleys and ridges of the fingerprint, the light source irradiating the finger will produce different reflections, so that the light intensity reaching the pin of the photodiode will change, resulting in different photocurrent differences. Under the control of the fingerprint sensor, the current difference of each photodiode pin can be read out in turn as long as the signal of the pattern reading signal terminal Readout is collected, and the detection of the fingerprint valley ridge can be realized.
在具体实施时，如图7所示，感光单元Sensor包括一个光敏二极管和三个薄膜晶体管T1、T2和T3。感光单元Sensor感应的纹路信号通过纹路读取信号端Readout提供给噪声检测电路100，实现纹路识别。In a specific implementation, as shown in FIG. 7 , the photosensitive unit Sensor includes one photosensitive diode and three thin film transistors T1 , T2 and T3 . The texture signal sensed by the photosensitive unit Sensor is provided to the noise detection circuit 100 through the texture reading signal terminal Readout to realize texture identification.
在具体实施时，纹路检测装置可以是单独设置的一个器件，例如指纹解锁器件，当然纹路检测装置也可以是与显示集成在一起的，在此不作限定。In a specific implementation, the texture detection device may be a separate device, such as a fingerprint unlocking device, of course, the texture detection device may also be integrated with the display, which is not limited here.
在具体实施时，当将纹路检测装置中的感应单元sensor分布在整个显示区域，可以实现全屏指纹识别。具体地，当感应单元做在显示区域内时，如图8所示，显示面板的每一像素区域内均设置一个感应单元sensor。进一步可以将感应单元S设置在黑矩阵对应的区域内，这样不会既不会影响显示，也不会降低开口率。In specific implementation, when the sensing units sensors in the texture detection device are distributed in the entire display area, full-screen fingerprint recognition can be realized. Specifically, when the sensing unit is formed in the display area, as shown in FIG. 8 , one sensing unit sensor is set in each pixel area of the display panel. Further, the sensing unit S can be arranged in the area corresponding to the black matrix, so that it will neither affect the display nor reduce the aperture ratio.
本发明实施例提供的上述噪声检测电路、噪声检测方法及纹路识别装置，利用控制单元对第一开关电路进行控制，使第一输入信号端接参考信号端或接地，使第二输入信号端接参考信号端或接地，从而差分放大器对接收的第一输入信号端和第二输入信号端在不同情况下的信号进行运算，并将运算结果利用模数转换器转换为数字信号，从而控制单元通过对模数转换器输出的数字信号进行分析，来确定纹路识别装置的噪声来源。In the above-mentioned noise detection circuit, noise detection method, and pattern identification device provided by the embodiments of the present invention, the control unit is used to control the first switch circuit, so that the first input signal is terminated with the reference signal terminal or ground, and the second input signal is terminated with Refer to the signal terminal or ground, so that the differential amplifier operates on the received signals of the first input signal terminal and the second input signal terminal under different conditions, and converts the operation result into a digital signal using an analog-to-digital converter, so that the control unit passes The digital signal output by the analog-to-digital converter is analyzed to determine the noise source of the pattern recognition device.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108134595A (en) | 2018-06-08 |
| US10915775B2 (en) | 2021-02-09 |
| US20190213432A1 (en) | 2019-07-11 |
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